1994 GMC Jimmy truck won't start

Tiny
STEPHEN100
  • MEMBER
  • 1994 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 225,000 MILES
Hi hope you can help me my truck won't start when warm it just floods and black smoke comes out of the exhust
Monday, August 23rd, 2010 AT 8:54 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Probable causes of an engine running rich are as follows:

1. Excessive fuel pressure can be cause by restricted fuel return line or defective fuel pressure regulator.
2. Defective Oxygen Sensors.
3. Leaking injectors and fuel pressure regulator.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.
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Monday, August 23rd, 2010 AT 9:00 AM

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